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			background-color: #d8d8d8;
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		h2{
			margin: 0 0 20px 10px;
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			font-weight: bold;
/*			字体加粗*/
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<body>
	<div class="a">
		<h2>工具</h2>
		<p>在线换算器</p>
		<p>Scheme It</p>
		<p>参考设计库</p>
		<p>对照检索</p>
	</div>
</body>
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